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b6dbd83901
(build error has been fixed - juhosg) Signed-off-by: Arnaud Lacombe <lacombar@gmail.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23975 3c298f89-4303-0410-b956-a3cf2f4a3e73
311 lines
7.0 KiB
C
311 lines
7.0 KiB
C
/*
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* Parallel flash driver for the Atheros AR91xx SoC
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*
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* Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/platform_device.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/map.h>
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#include <linux/mtd/partitions.h>
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#include <linux/io.h>
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#include <asm/mach-ar71xx/ar71xx.h>
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#include <asm/mach-ar71xx/ar91xx_flash.h>
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#define DRV_NAME "ar91xx-flash"
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struct ar91xx_flash_info {
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struct mtd_info *mtd;
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struct map_info map;
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#ifdef CONFIG_MTD_PARTITIONS
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int nr_parts;
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struct mtd_partition *parts;
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#endif
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};
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static map_word ar91xx_flash_read(struct map_info *map, unsigned long ofs)
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{
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map_word val;
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if (map_bankwidth_is_1(map))
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val.x[0] = __raw_readb(map->virt + (ofs ^ 3));
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else if (map_bankwidth_is_2(map))
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val.x[0] = __raw_readw(map->virt + (ofs ^ 2));
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else
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val = map_word_ff(map);
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return val;
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}
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static void ar91xx_flash_write(struct map_info *map, map_word d,
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unsigned long ofs)
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{
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if (map_bankwidth_is_1(map))
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__raw_writeb(d.x[0], map->virt + (ofs ^ 3));
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else if (map_bankwidth_is_2(map))
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__raw_writew(d.x[0], map->virt + (ofs ^ 2));
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mb();
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}
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static map_word ar91xx_flash_read_lock(struct map_info *map, unsigned long ofs)
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{
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map_word ret;
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ar71xx_flash_acquire();
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ret = ar91xx_flash_read(map, ofs);
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ar71xx_flash_release();
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return ret;
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}
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static void ar91xx_flash_write_lock(struct map_info *map, map_word d,
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unsigned long ofs)
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{
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ar71xx_flash_acquire();
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ar91xx_flash_write(map, d, ofs);
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ar71xx_flash_release();
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}
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static void ar91xx_flash_copy_from_lock(struct map_info *map, void *to,
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unsigned long from, ssize_t len)
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{
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ar71xx_flash_acquire();
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inline_map_copy_from(map, to, from, len);
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ar71xx_flash_release();
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}
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static void ar91xx_flash_copy_to_lock(struct map_info *map, unsigned long to,
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const void *from, ssize_t len)
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{
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ar71xx_flash_acquire();
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inline_map_copy_to(map, to, from, len);
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ar71xx_flash_release();
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}
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static int ar91xx_flash_remove(struct platform_device *pdev)
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{
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struct ar91xx_flash_platform_data *pdata;
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struct ar91xx_flash_info *info;
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info = platform_get_drvdata(pdev);
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if (info == NULL)
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return 0;
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platform_set_drvdata(pdev, NULL);
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if (info->mtd == NULL)
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return 0;
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pdata = pdev->dev.platform_data;
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#ifdef CONFIG_MTD_PARTITIONS
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if (info->nr_parts) {
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del_mtd_partitions(info->mtd);
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kfree(info->parts);
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} else if (pdata->nr_parts) {
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del_mtd_partitions(info->mtd);
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} else {
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del_mtd_device(info->mtd);
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}
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#else
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del_mtd_device(info->mtd);
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#endif
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map_destroy(info->mtd);
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return 0;
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}
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static const char *rom_probe_types[] = { "cfi_probe", "jedec_probe", NULL };
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#ifdef CONFIG_MTD_PARTITIONS
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static const char *part_probe_types[] = { "cmdlinepart", "RedBoot", NULL };
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#endif
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static int ar91xx_flash_probe(struct platform_device *pdev)
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{
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struct ar91xx_flash_platform_data *pdata;
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struct ar91xx_flash_info *info;
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struct resource *res;
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struct resource *region;
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const char **probe_type;
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int err = 0;
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pdata = pdev->dev.platform_data;
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if (pdata == NULL)
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return -EINVAL;
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info = devm_kzalloc(&pdev->dev, sizeof(struct ar91xx_flash_info),
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GFP_KERNEL);
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if (info == NULL) {
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err = -ENOMEM;
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goto err_out;
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}
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platform_set_drvdata(pdev, info);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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err = -ENOENT;
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goto err_out;
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}
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dev_info(&pdev->dev, "%.8llx at %.8llx\n",
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(unsigned long long)(res->end - res->start + 1),
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(unsigned long long)res->start);
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region = devm_request_mem_region(&pdev->dev,
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res->start, res->end - res->start + 1,
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dev_name(&pdev->dev));
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if (region == NULL) {
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dev_err(&pdev->dev, "could not reserve memory region\n");
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err = -ENOMEM;
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goto err_out;
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}
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info->map.name = dev_name(&pdev->dev);
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info->map.phys = res->start;
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info->map.size = res->end - res->start + 1;
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info->map.bankwidth = pdata->width;
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info->map.virt = devm_ioremap(&pdev->dev, info->map.phys,
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info->map.size);
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if (info->map.virt == NULL) {
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dev_err(&pdev->dev, "failed to ioremap flash region\n");
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err = -EIO;
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goto err_out;
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}
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simple_map_init(&info->map);
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if (pdata->is_shared) {
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info->map.read = ar91xx_flash_read_lock;
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info->map.write = ar91xx_flash_write_lock;
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info->map.copy_from = ar91xx_flash_copy_from_lock;
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info->map.copy_to = ar91xx_flash_copy_to_lock;
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} else {
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info->map.read = ar91xx_flash_read;
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info->map.write = ar91xx_flash_write;
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}
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probe_type = rom_probe_types;
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for (; info->mtd == NULL && *probe_type != NULL; probe_type++)
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info->mtd = do_map_probe(*probe_type, &info->map);
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if (info->mtd == NULL) {
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dev_err(&pdev->dev, "map_probe failed\n");
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err = -ENXIO;
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goto err_out;
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}
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info->mtd->owner = THIS_MODULE;
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#ifdef CONFIG_MTD_PARTITIONS
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if (pdata->nr_parts) {
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dev_info(&pdev->dev, "using static partition mapping\n");
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add_mtd_partitions(info->mtd, pdata->parts, pdata->nr_parts);
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return 0;
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}
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err = parse_mtd_partitions(info->mtd, part_probe_types,
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&info->parts, 0);
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if (err > 0) {
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add_mtd_partitions(info->mtd, info->parts, err);
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return 0;
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}
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#endif
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add_mtd_device(info->mtd);
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return 0;
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err_out:
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ar91xx_flash_remove(pdev);
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return err;
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}
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#ifdef CONFIG_PM
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static int ar91xx_flash_suspend(struct platform_device *dev, pm_message_t state)
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{
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struct ar91xx_flash_info *info = platform_get_drvdata(dev);
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int ret = 0;
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if (info->mtd->suspend)
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ret = info->mtd->suspend(info->mtd);
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if (ret)
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goto fail;
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return 0;
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fail:
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if (info->mtd->suspend) {
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BUG_ON(!info->mtd->resume);
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info->mtd->resume(info->mtd);
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}
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return ret;
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}
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static int ar91xx_flash_resume(struct platform_device *pdev)
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{
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struct ar91xx_flash_info *info = platform_get_drvdata(pdev);
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if (info->mtd->resume)
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info->mtd->resume(info->mtd);
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return 0;
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}
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static void ar91xx_flash_shutdown(struct platform_device *pdev)
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{
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struct ar91xx_flash_info *info = platform_get_drvdata(pdev);
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if (info->mtd->suspend && info->mtd->resume)
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if (info->mtd->suspend(info->mtd) == 0)
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info->mtd->resume(info->mtd);
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}
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#else
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#define ar91xx_flash_suspend NULL
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#define ar91xx_flash_resume NULL
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#define ar91xx_flash_shutdown NULL
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#endif
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static struct platform_driver ar91xx_flash_driver = {
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.probe = ar91xx_flash_probe,
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.remove = ar91xx_flash_remove,
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.suspend = ar91xx_flash_suspend,
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.resume = ar91xx_flash_resume,
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.shutdown = ar91xx_flash_shutdown,
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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};
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static int __init ar91xx_flash_init(void)
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{
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return platform_driver_register(&ar91xx_flash_driver);
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}
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static void __exit ar91xx_flash_exit(void)
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{
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platform_driver_unregister(&ar91xx_flash_driver);
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}
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module_init(ar91xx_flash_init);
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module_exit(ar91xx_flash_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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MODULE_DESCRIPTION("Parallel flash driver for the Atheros AR91xx SoC");
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MODULE_ALIAS("platform:" DRV_NAME);
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